<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>下载逗可返</title>
</head>
<body>
    <div class="container">
        <img class="btn" src="img/ljxzzc.png">
    </div>
</body>
</html>
<style lang="css">
*{
    margin: 0px;
    padding: 0px;
}
.container{
    background-image: url("https://images.xmojiang.com/bg.png");
    background-repeat: round;
    width: 100vw;
    height: 100vh;
}
.container > .btn{
    width: 50vw;
    height: 6.5vh;
    position: fixed;
    bottom: 19vh;
    left: -25vw;
    margin-left: 50%;
}
</style>